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Kim, Byungmin
Geotechnical Earthquake Engineering Research Group
Research Interests
  • Seismic Site Response Analysis, Seismic Hazard Analysis, Slope Stability Analysis, Geospatial Analysis, Soil-Structure Interaction Analysis

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Source and path effects of the ground motions recorded during the 2020 Haenam earthquake swarm in South Korea

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Title
Source and path effects of the ground motions recorded during the 2020 Haenam earthquake swarm in South Korea
Author
Ahn, Jae-KwangKim, ByungminKwak, Dongyoup
Issue Date
2021-02
Publisher
GEOLOGICAL SOCIETY KOREA
Citation
GEOSCIENCES JOURNAL, v.25, no.1, pp.83 - 92
Abstract
On the southwestern Korean Peninsula, a 74-earthquake swarm was recorded between April 26 and May 9, 2020, with a maximum local magnitude (M-L) of 3.1. This is the third such event since instrumental seismic recordings began in South Korea in 1978. Because this area is located on a stable continent, this rare swarm event provides an opportunity to analyze earthquake sources and attenuation characteristics in this region. In this study, we first analyzed the intensity measure (IM) and the frequency content of the ground motions recorded during this swarm event. Next, we investigated the effects of earthquake magnitude and source-to-site distance on IMs, compared with those derived from international and local ground-motion models (GMMs). We found that the magnitude scaling slope (i.e., variation of IMs depending on M-L) of the earthquake swarm records for M-L >= 1.8 is similar to the slopes derived from GMMs, while for M-L < 1.8, the slope from the records is steeper. For distance scaling (i.e., variation of IMs depending on source-to-site distance), the slopes from records are gentler than those from GMMs. This indicates that ground motion attenuates slowly in this region, compared to other global regions.
URI
https://scholarworks.unist.ac.kr/handle/201301/55689
URL
https://link.springer.com/article/10.1007%2Fs12303-020-0048-1
DOI
10.1007/s12303-020-0048-1
ISSN
1226-4806
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